139 LineInit(g, lat1, lon1, azi1, salp1, calp1, caps);
145 real& lat2, real& lon2, real& azi2,
146 real& s12, real& m12,
147 real& M12, real& M21,
149 outmask &= _caps & OUT_MASK;
155 real sig12, ssig12, csig12, E2 = 0, AB1 = 0;
163 tau12 = s12_a12 / (_b * _eE0),
167 E2 = - _eE.
deltaEinv(_stau1 * c + _ctau1 * s, _ctau1 * c - _stau1 * s);
168 sig12 = tau12 - (E2 - _eE1);
173 real ssig2, csig2, sbet2, cbet2, salp2, calp2;
175 ssig2 = _ssig1 * csig12 + _csig1 * ssig12;
176 csig2 = _csig1 * csig12 - _ssig1 * ssig12;
177 real dn2 = _eE.
Delta(ssig2, csig2);
180 E2 = _eE.
deltaE(ssig2, csig2, dn2);
182 AB1 = _eE0 * (E2 - _eE1);
185 sbet2 = _calp0 * ssig2;
187 cbet2 = hypot(_salp0, _calp0 * csig2);
190 cbet2 = csig2 = tiny_;
192 salp2 = _salp0; calp2 = _calp0 * csig2;
195 s12 = arcmode ? _b * (_eE0 * sig12 + AB1) : s12_a12;
198 real somg2 = _salp0 * ssig2, comg2 = csig2,
199 E = copysign(real(1), _salp0);
201 real cchi2 = _f1 * dn2 * comg2;
204 - (atan2( ssig2, csig2) - atan2( _ssig1, _csig1))
205 + (atan2(E * somg2, cchi2) - atan2(E * _somg1, _cchi1)))
206 : atan2(somg2 * _cchi1 - cchi2 * _somg1,
207 cchi2 * _cchi1 + somg2 * _somg1);
209 _e2/_f1 * _salp0 * _hH0 *
210 (sig12 + (_eE.
deltaH(ssig2, csig2, dn2) - _hH1));
224 real J12 = _k2 * _dD0 * (sig12 + (_eE.
deltaD(ssig2, csig2, dn2) - _dD1));
228 m12 = _b * ((dn2 * (_csig1 * ssig2) - _dn1 * (_ssig1 * csig2))
229 - _csig1 * csig2 * J12);
231 real t = _k2 * (ssig2 - _ssig1) * (ssig2 + _ssig1) / (_dn1 + dn2);
232 M12 = csig12 + (t * ssig2 - csig2 * J12) * _ssig1 / _dn1;
233 M21 = csig12 - (t * _ssig1 - _csig1 * J12) * ssig2 / dn2;
237 if (outmask &
AREA) {
238 real B42 = _aA4 == 0 ? 0 :
241 if (_calp0 == 0 || _salp0 == 0) {
243 salp12 = salp2 * _calp1 - calp2 * _salp1;
244 calp12 = calp2 * _calp1 + salp2 * _salp1;
261 salp12 = _calp0 * _salp0 *
262 (csig12 <= 0 ? _csig1 * (1 - csig12) + ssig12 * _ssig1 :
263 ssig12 * (_csig1 * ssig12 / (1 + csig12) + _ssig1));
266 S12 = _c2 * atan2(salp12, calp12) + _aA4 * (B42 - _bB41);
Math::real GenPosition(bool arcmode, real s12_a12, unsigned outmask, real &lat2, real &lon2, real &azi2, real &s12, real &m12, real &M12, real &M21, real &S12) const